Dr. Polycount goes over five common problems with 3D models, why they are important to fix, and how to resolve them. Problems include: Oversized textures, not using double-sided textures, non-planar surfaces, Intersecting Geometry, and unmerged vertices. 3D modelers of all levels can benefit from Dr. Polycounts advice in this video. ... 3DVIA "Dassault Systemes"